The superplastic deformation of electron beam welded aluminum lithium alloy  

作　　者：Jiang Xunyan Cheng Donghai Chen Yiping Hu Dean 江训焱;程东海;陈益平;胡德安

机构地区：[1]Aviation Manufacturing Engineering College,Nanchang Hangkong University

出　　处：《China Welding》2018年第1期41-45,共5页中国焊接（英文版）

基　　金：Project (51465042) supported by the National Natural Science Foundation of China

摘　　要：The superplastic deformation behavior and microstructure evolution of electron beam welded 5A90 aluminum lithium alloy were investigated. The results indicated that the electron beam weld joint had good superplasticity under a suitable deformation condition. The elongation increased first and then decreased with increasing deformation temperature and initial strain rate,and the maximal elongation of 171.1% was obtained at the temperature of 450 ℃ and the strain rate of 5 × 10^(-3) s^(-1).The microstructure observation indicated that the fine equiaxed dendrite of weld bead transformed into coarse equiaxed in the initial stage( strain ε≤0.7),then refined in the later stage of superplastic deformation.The eutectic structure gradually decreased with the increase of strain. While the microstructure of HAZ was refined and equiaxed with the increase of strain.The superplastic deformation behavior and microstructure evolution of electron beam welded 5A90 aluminum lithium alloy were investigated. The results indicated that the electron beam weld joint had good superplasticity under a suitable deformation condition. The elongation increased first and then decreased with increasing deformation temperature and initial strain rate,and the maximal elongation of 171.1% was obtained at the temperature of 450 ℃ and the strain rate of 5 × 10^(-3) s^(-1).The microstructure observation indicated that the fine equiaxed dendrite of weld bead transformed into coarse equiaxed in the initial stage( strain ε≤0.7),then refined in the later stage of superplastic deformation.The eutectic structure gradually decreased with the increase of strain. While the microstructure of HAZ was refined and equiaxed with the increase of strain.

关 键 词：ALUMINUM LITHIUM alloy ELECTRON beam WELD SUPERPLASTIC DEFORMATION microstructure evolution 

分 类 号：TG4[金属学及工艺—焊接]